MACROMOLECULAR CHEMISTRY AND PHYSICS
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2025
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IF 2.7
Shiyang Wang,Chunlin Yang,Yibin Zhan,Ning Zhao,Jianhao Guo,Xiaofeng Xue,Liting Wei,Shuang Chen,Yang Yang,Boping Liu,Yulong Jin
Producing polyethylene (PE) with broad or bimodal molecular weight distribution (MWD) in one reactor using bimetallic catalysis is a cost- and energy-effective technique in the polyolefin industry. However, this technique is still faced with great challenges, including the difficulty in molecular weight (MW) regulation and poisonous effect commonly observed between the two metals resulting from strong interactions. In this work, a series of bimetallic catalysts CpCr/imidoV/silica with different Cr/V molar ratios were fabricated by anchoring Cp 2 Cr onto imidoV/silica, and the two mono-metallic catalysts CpCr/silica and imidoV/silica were also prepared for comparison. The results show that not only the activity but also the responses to alkyl-Al cocatalyst, polymerization temperature, and hydrogen were distinct between CpCr/silica and imidoV/silica. The interactions between Cr and V sites seemed to be weak. As a result, their different catalytic behaviors were generally reserved, thus making it possible to regulate the activity and the MW of PE products by adjusting Cr/V molar ratio. Thanks to the distinct hydrogen responses of Cr and V on bimetallic catalysts, bi- or broad-modal PE was successfully synthesized by hydrogen regulation. The relative content of low and high MW fractions could be adjusted by altering both the Cr/V molar ratio and hydrogen partial pressure.
研究领域:
高分子化学
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催化化学
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材料科学
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聚合物合成
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配位聚合
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高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
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2018
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IF 1.011
Min-Zun Ji,Feng-Chao Guo,Pu Zhang,Zhi-Xin Guo
The mechanochemical reaction of C60 and Bi(NO3)3·5H2O was performed under ball-milling condition. The product was well characterized by spectroscopic methods such as IR, Raman, UV-vis, 13C NMR, as well as elemental analysis method. The spectroscopic investigation indicates that some hydroxyl and nitro groups are attached to the C60 and no profound structural changes occur for the C60 cage in the product. The elemental analysis gives an average composition of C60(NO2)2(OH)21 for the product. A possible mechanism is suggested for the reaction.
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高影响因子
Acta Biomaterialia
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2020
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IF 7.242
Meifei Lian,Yu Han,Binbin Sun,Ling Xu,Xiaofeng Wang,Bing Ni,Wenbo Jiang,Zhiguang Qiao,Kerong Dai,Xiuyin Zhang
The guided bone regeneration (GBR) concept has been extensively utilized to treat maxillofacial bone defects in clinical practice. However, the repair efficacy of currently available GBR membranes is often compromised by their limited bone regeneration potential and deficient antibacterial activity . In this study, inspired by the bi-layered structure design of the commonly used Bio-Gide Ⓡ membrane, we designed and fabricated a new kind of multifunctional bi-layered “GBR scaffold” combining solution electrospinning writing (SEW) and solution electrospinning (SES) techniques using a single SEW printer. Copper-loaded mesoporous silica nanoparticles ( [email protected] ) were incorporated into the poly(lactic-co-glycolic acid)/gelatin (PLGA/Gel, denoted as PG) fiber matrix to construct a composite [email protected] fibrous scaffold. The obtained GBR scaffold consisted of a loose and porous SEW layer to support and facilitate bone ingrowth, and a dense and compact SES layer to resist non-osteoblast interference. The resulting enhanced mechanical properties, coordinated degradation profile, and facile preparation procedure imparted the composite scaffold with good clinical feasibility. In vitro biological experiments indicate that the [email protected] composite scaffold exhibited favorable osteogenic and antibacterial properties. Furthermore, an in vivo rat periodontal defect model further confirmed the promising bone regeneration efficacy of the [email protected] scaffold. In conclusion, the developed electrowritten [email protected] bi-layered scaffold with hierarchical architecture and concurrent osteogenic and antibacterial functions may hold great potential for application in GBR.
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PubMed
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1409-1414
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IF 8.897
Liu Jinze,Li Yuhang,Wang Yating,Xiao Chuqian,Liu Miaomiao,Zhou Xiaodong,Jiang Hao,Li Chunzhong
Electrochemical reduction of CO 2 to valuable formate as liquid fuel is a promising way to alleviate the greenhouse effect. The edge active sites in bismuth (Bi) nanosheets play a critical role in the electrochemical reduction of CO 2 into formate, which enable the operation of CO 2 reduction with high cathodic energy efficiency, especially under large current densities of ≥ 200 mA/cm 2 . However, the undesirable reconstruction of small Bi nanosheets into large nanosheets leads to the decreasing of edge active sites during electrocatalysis. Here we report stable isolated ultrasmall bismuth nanosheets-synthesized by in-situ electrochemical transformation of ligands covered bismuth vanadate-on silver nanowires as an efficient electrocatalyst for CO 2 -to-formate reduction. The cooperative electrocatalyst achieves a formate current density of 186 mA/cm 2 and a cathodic energy efficiency of 75% for formate, which is the only best compared to the literature results. Operando Raman and morphologic measurements demonstrate that the excellent energy utilization of the electrocatalyst is originated from the rich edge active sites with Bi-O species of the ultrasmall Bi nanosheets.
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Advances in Wound Care
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2021
·Vol. 10
·期 8
·401-414
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IF 4.73
Dongdong Xu,Gu Cheng,Jinhong Dai,Zhi Li
Objective: Osteochondral defect presents a big challenge for clinical treatment. This study aimed at constructing a bi-layered composite chitosan/chitosan-β-tricalcium phosphate (CS/CS-β-TCP) scaffold and at repairing the rat osteochondral defect.Approach: The bi-layered CS/CS-β-TCP scaffold was fabricated by lyophilization, and its microstructure was observed by a scanning electron microscope. Chondrocytes and bone marrow stem cells (BMSCs) were seeded into the CS layer and the CS-β-TCP layer, respectively. Viability and proliferation ability of the cells were observed under a confocal microscope. After subcutaneous implantation, the chondrogenic ability of the CS layer and osteogenic ability of the CS-β-TCP layer were evaluated by immunofluorescence. Then, the bi-layered scaffolds were implanted into the rat osteochondral defects and the harvested samples were macroscopically and histologically evaluated.Results: The bi-layered CS/CS-β-TCP scaffold exhibited the distinctive microstructures for each layer. The seeded chondrocytes in the CS layer could maintain the chondrogenic lineage, whereas BMSCs in the CS-β-TCP layer could continually differentiate into the osteogenic lineage. Moreover, cells in both layers could maintain well viability and excellent proliferation ability. For the in vivo study, the newly formed tissues in the bi-layered scaffolds group were similar with the native osteochondral tissues, which comprised hyaline-like cartilage and subchondral bone, with better repair effects compared with those of the pure CS group and the blank control group.Innovation: This is the first time that the bi-layered composite CS/CS-β-TCP scaffold has been fabricated and evaluated with respect to osteochondral defect repair.Conclusion: The bi-layered CS/CS-β-TCP scaffolds could facilitate osteochondral defect repair and might be the promising candidates for osteochondral tissue engineering.
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
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IF 8.456
Lile Dong,Peng Zhang,Xiangjian Liu,Ruiping Deng,Kaimin Du,Jing Feng,Hongjie Zhang
Recent development of precise nanomedicine has aroused an overwhelming interest in integration of diagnosis and treatment for cancers. Designing renal-clearable and targeting nanoparticles (NPs) has specific cancer theranostic implications and remains a challenging task. In this work, the ultrasmall folic acid (FA) and bovine serum albumin-modified Bi–Bi2S3 heterostructure nanoparticles NPs (Bi–Bi2S3/BSA&FA NPs) with excellent computed tomography (CT) and photoacoustic imaging abilities and outstanding photothermal performances were synthesized in an aqueous phase route via a simple method. Bi–Bi2S3/BSA&FA NPs have the following criteria: (i) Bi–Bi2S3/BSA&FA NPs with heterostructure possess better stability than Bi NPs and higher Bi content than Bi2S3 NPs, which are conducive to the enhancement of CT imaging effect; (ii) Bi–Bi2S3/BSA&FA NPs with FA molecules on the surface could target the tumor site effectively; (iii) Bi–Bi2S3/BSA&FA NPs could inhibit tumor growth effectively under 808 nm laser irradiation; (iv) ultrasmall Bi–Bi2S3/BSA&FA NPs could be cleared through kidney and liver within a reasonable time, avoiding a long-term retention/toxicity. Therefore, the renal clearable Bi–Bi2S3/BSA&FA NPs are a promising agent for targeting cancer theranostics.
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PubMed
高影响因子
GREEN CHEMISTRY
·
2025
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IF 9.2
Huihui Ding,Huanhuan Wu,Jun Ma,Xiang Li,Shuangshuang Huai,Shijian Zhang,Wenbin Ruan,Xiuxiu Huang,Xiufang Wang,Wenjie Xie
The high interfacial charge transfer barrier has been a primary thermodynamic obstacle in enhancing the catalytic performance of heterojunction materials. Optimizing the interfacial environment is a promising strategy to attain superior catalytic efficiency. Hence, a Bi/Bi2MoO6/Bi24O31Br10 (Bi/BMO/BOB) composite photocatalyst was constructed by introducing a Bi–O–Mo bridge bond between the BMO and BOB interfaces and modifying metal active sites on the surface of the complex. Bi/BMO/BOB has a good capacity for CO2 photoreduction to CO. The CO yield of the Bi/BMO/BOB photocatalyst is 68.29 μmol g−1 h−1, which is obviously higher than those of the pristine BMO and BOB. As proved by density functional theory (DFT) calculations and experimental characterization, the Bi–O–Mo interface bridge bond adjusts the electronic structure of the contact interface and enhances the interface charge separation and transport rate. Moreover, the metal Bi nanoparticles synthesized through in situ reduction not only realize electron transfer and storage as electron collectors, but also strengthen the adsorption of CO2 molecules. The synergistic action of the two can allow the effective transfer of photogenerated electrons from BMO to BOB, which then accumulate on Bi. Such stepwise transfer of electrons increases the speed of photocatalytic reduction processes that involve multiple electrons, and effectively reduces the reaction energy barrier in the process of CO2 reduction. This mode of interatomic electron transfer bridges combined with the metal active sites not only solves the stability issues in bismuth-based semiconductors, but also aids in the development of more efficient photocatalytic systems for reduction of CO2.
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高影响因子
NEW CARBON MATERIALS
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2020
·
IF 1.761
Chi Song,Lin-jie Wang,Si-miao Sun,Ying Wu,Li-jie XU,Lu Gan
A series of ternary composite photocatalysts of Bi 2 O 3 /Bi embedded in porous carbon (Bi 2 O 3 /Bi/PC) was prepared by the high-temperature pyrolysis of a bismuth-based metal organic framework (CAU-17(Bi)). They were used as photocatalysts for the degradation of organic Rhodamine B dye (RhB) in water under visible light. Results showed that the Bi 2 O 3 /Bi/PC composites with different Bi 2 O 3 /Bi ratios could be obtained through changing the extent of the carbothermal reduction of Bi 2 O 3 during pyrolysis. The photocatalystpyrolyzed at 800 o C showed the highest photocatalytic performance and had a wide applicable pH value range and excellent recyclability and stability.The components in the ternary composites exhibited a synergetic effect in the removal of RhB, where Bi 2 O 3 acted as a low-band gap semiconductor, metallic Bi transferred electrons generated by visible light excitation to the graphitic structure in porous carbon to inhibit the recombination of electrons with holes. The holes and peroxide radicals were the main active species. This study provides a new way for the design and preparation of visible-light active and high-performance photocatalysts for organic contaminant degradation in aqueous media by using metal organic frameworks as a multicomponent precursor.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Shengnan Huang,Fan Tian,Jiawei Dai,Xuesong Tian,Guangfang Li,Yunling Liu,Zhiquan Chen,Rong Chen
Chlorophenols (CPs) treatment in water is a huge challenge due to its native robustness and harmful chlorinated by-products in degradation. In this work, we developed a specific BiO 2-x with high density Bi-O-Bi-O vacancy via a facile hydrothermal process. Extraordinary CPs removal ability under near infrared (NIR, >700 nm) is achieved over the as-prepared product. The presence of vacancies not only induced strong interactions between CPs and photocatalyst, but also promoted singlet oxygen ( 1 O 2 ) and photogenerated holes (h + ) generation. Furthermore, the generated 1 O 2 is found mainly originating from lattice oxygen release and the superoxide radicals ( O 2 − ) oxidation from BiO 2-x . Such performance could be well-maintained under wide pH range as well as in the presence of different constitutes in water matrix. This work unravels a unique function of BiO 2-x photocatalyst for CPs decomposition and provide a rational design of highly efficient photocatalysts toward optimization of pollutants degradations.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 16
·5801-5809
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IF 5.7
Shuang Wu,Wen-Guang Li,Yu-Hua Huang,Xu-Dong Wang,Dai-Bin Kuang
Bi-based halide perovskites, with much lower toxicity than Pb-based perovskites, have triggered enormous interest in optoelectronic applications. However, most Bi-based perovskites have low-dimensional crystalline structures which may have potential negative effects on carrier transport. Herein, zero-dimensional (CHDA)BiI5·3H2O is transformed into two-dimensional double perovskite (CHDA)2CuBiI8·0.5H2O through Cu+ introduction engineering, which shows increased orbital overlap and improved electronic band structure dispersion compared with the former. Notably, a 104-fold enhancement in photoresponse on–off ratio is observed for the (CHDA)2CuBiI8·0.5H2O SC photodetector. This advancement not only enhances our understanding of the intricate relationship between crystal structure and charge transport behavior in Bi-based perovskites but also paves the way for highly efficient and environmentally friendly optoelectronic device development.
研究领域:
材料科学
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光电子学
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
·
IF 4.3
Tiantian Zhou,Ju Liu,Huanhui Zhan,Ping Wang,Kefan Chao,Muhua Chen,Junjie Zheng,Bo Fu
Herein, through in-situ growing BiVO 4 nanosheets on CAU-17 (Bi-based metal-organic framework) with a hydrothermal method , a BiVO 4 /CAU-17 Z-scheme heterojunction photocatalyst is fabricated. The composite manifest that the BiVO 4 is well dispersed on CAU-17 while CAU-17 surface transforms into a well-defined sheet-like morphology. As a result of the construction of Z-scheme heterojunction , in contrast to pure BiVO 4 and CAU-17, composites have excellent photodegradation ability for Rhodamine B (RhB) and Congo Red (CR), and achieve synergistic removal of pollutants in the RhB/CR binary system, indicating it has great potential in the treatment of dye wastewater. At the same time, it still maintains outstanding photocatalytic performance after five cycles of testing, demonstrating superior reusability and durability.
研究领域:
环境科学
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材料科学
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高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 49
·495405
·
IF 3.551
Xiaozhen Ren,Xunshuang Zhang,Ruichen Guo,Shulan Zhang,Lezhi Wang,Xipeng Pu
Bi metal attached BiOBr with oxygen defect (BiOBr(3)-Bi(x%, x = 10, 20, 30)) nanosheets was prepared via the hydrothermal process in this study. The different characterization techniques of x-ray diffraction, x-ray photoelectron spectrometer, electron spin resonance (ESR), field emission scanning electron microscope, and high resolution transmission electron microscope were used to distinguish the composition, crystal structure, and morphology of the samples. Under visible light irradiation, the BiOBr(3)-Bi(x%, x = 10, 20, 30) samples exhibited improved photocatalytic activity for the degradation of colored dyes (RhB) and colorless tetracycline hydrochloride. Such an improvement was ascribed to the widened visible light absorption and enhanced separation of the photogenerated electron–hole pairs because of the synergistic effect of oxygen vacancies and Bi metal with plasmon resonance effects. A possible photocatalytic mechanism of the quasi Z-scheme process was proposed on the basis of ESR measurements and radical-trapping experiments.
研究领域:
材料科学
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环境科学
·
化学
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高影响因子
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